Thanks a lot of answering the question I have.
The questions I have seem all be easily be possible.
So one difficult question/challenge of which I wonder is an easy solution
I working with the example: http://gojs.net/latest/samples/flowchart.html
Is it possible that you can only drag in one object that has only “input” connector at the top.
So I have multiple objects you can drag in, to the canvass.
There are also multiple objects that only have an input connector at the top.
Is it possible to make an restriction, you can only drag in one object that has an input connector at the top?
I hope I make my question clear. And again thanks for all the help.